DFD Load from Text File VI

Digital Filter Design VIs and Functions

DFD Load from Text File VI

Owning Palette: Utilities VIs

Installed With: Digital Filter Design Toolkit

Retrieves a filter from a text file.

Note  This VI uses periods as the decimal points in the coefficients values.

Example

 Place on the block diagram  Find on the Functions palette
load type specifies whether to load a filter from the coefficients or from the zeroes, poles, and gain.

0From Coefficients (default)—Loads the filter from the filter coefficients.
1From Zero-Pole-Gain—Loads the filter from the zeroes, poles, and gain. For a filter with a finite impulse response (FIR) symmetric or antisymmetric structure, if you saved the filter to a text file by using the DFD Save to Text File VI and then load the filter from the text file by using the DFD Load from Text File VI, the new filter coefficients might not be exactly the same as the original filter coefficients because of the numeric errors occurred during the conversion between the filter coefficients and zero-pole-gain values.
file path in specifies the path to the file. If file path in is empty (default) or <Not A Path>, this VI displays the Select File Path dialog box from which you can select a file. This VI returns an error if you specify a file path that does not exist or if you click the Cancel button on the dialog box.
error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source specifies the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
filter out returns the filter you loaded from the text file.
file path out returns the path to the file to which this VI saved the filter.
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.

Example

Refer to the Save and Load Filter to and from Text File VI in the labview\examples\Digital Filter Design\Getting Started\Apply Filters directory for an example of using the DFD Load from Text File VI.

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